Aoxa is right. If it were a full Barred rock cockerel it would have a lot more white since it would have two barred genes. If you look at a BR hen (which only has one barred gene) in coloration it looks very much like the OP's rooster/cockerel. We bought a "barred rock pullet" this spring that ended up being a cockerel that looks identical to the OP's bird. Looking back at our chick pictures, I'm 99.9% sure they sold us a black sex-link cockerel. Was kinda mad about it, but he's a sweet little guy and I hope he can stick around for a while.
